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69 lines
2.2 KiB
Plaintext
69 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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SSL_get_peer_cert_chain, SSL_get0_verified_chain - get the X509 certificate
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chain of the peer
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *ssl);
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STACK_OF(X509) *SSL_get0_verified_chain(const SSL *ssl);
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=head1 DESCRIPTION
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SSL_get_peer_cert_chain() returns a pointer to STACK_OF(X509) certificates
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forming the certificate chain sent by the peer. If called on the client side,
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the stack also contains the peer's certificate; if called on the server
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side, the peer's certificate must be obtained separately using
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L<SSL_get_peer_certificate(3)>.
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If the peer did not present a certificate, NULL is returned.
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NB: SSL_get_peer_chain() returns the peer chain as sent by the peer: it
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only consists of certificates the peer has sent (in the order the peer
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has sent them) it is B<not> a verified chain.
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SSL_get0_verified_chain() returns the B<verified> certificate chain
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of the peer including the peer's end entity certificate. It must be called
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after a session has been successfully established. If peer verification was
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not successful (as indicated by SSL_get_verify_result() not returning
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X509_V_OK) the chain may be incomplete or invalid.
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=head1 NOTES
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If the session is resumed peers do not send certificates so a NULL pointer
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is returned by these functions. Applications can call SSL_session_reused()
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to determine whether a session is resumed.
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The reference count of each certificate in the returned STACK_OF(X509) object
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is not incremented and the returned stack may be invalidated by renegotiation.
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If applications wish to use any certificates in the returned chain
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indefinitely they must increase the reference counts using X509_up_ref() or
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obtain a copy of the whole chain with X509_chain_up_ref().
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=head1 RETURN VALUES
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The following return values can occur:
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=over 4
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=item NULL
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No certificate was presented by the peer or no connection was established
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or the certificate chain is no longer available when a session is reused.
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=item Pointer to a STACK_OF(X509)
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The return value points to the certificate chain presented by the peer.
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=back
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=head1 SEE ALSO
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L<ssl(3)>, L<SSL_get_peer_certificate(3)>, L<X509_up_ref(3)>,
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L<X509_chain_up_ref(3)>
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=cut
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